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mehakNewbie

Asked: July 31, 2023In: CBSE

15. An iron spherical ball has been melted and recast into smaller balls of equal size. If the radius of each of the smaller balls is 1/4 of the radius of the original ball, how many such balls are made? Compare the surface area of all the smaller balls combined together with that of the original ball.

Explain the question using formulas given in the chapter. Class 10th Cbse, RD Sharma.

Deepak BoraNewbie

Asked: July 14, 2020In: CBSE, ICSE

Prove that : ( cos A–sin A+1)/( cos A +sin A–1) = cosec A + cot A, (using the identity cosec^2A = 1+cot2A).

Prove the following identities, where the angles involved are acute angles for which the expressions are defined. NCERT Maths Solutions class ...Read more

Deepak BoraNewbie

Asked: July 16, 2020In: ICSE

Ratio and proportion

Ratio and proportion class X

Deepak BoraNewbie

Asked: July 31, 2020In: CBSE, ICSE

Which term of the AP 5 /6 , 1, 1 1 /6 , 1 1 /3 , ….. is 3?

This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE Board. Here ...Read more

Deepak BoraNewbie

Asked: July 31, 2020In: CBSE, ICSE

How many three-digit natural numbers are divisible by 7?

This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE Board. Question ...Read more

Deepak BoraNewbie

Asked: August 5, 2020In: CBSE

A rocket is in the form of a circular cylinder closed at the lower end and a cone of the same radius is attached to the top. The radius of the cylinder is 2.5 m, its height is 21 m and the slant height of the cone is 8 m. Calculate the total surface area of the rocket.

In this problem they give rocket structure and rocket structure is the combination of cone and cylinder structure. This question ...Read more

Deepak BoraNewbie

Asked: August 9, 2020In: CBSE

A spherical cannon ball, 28 cm in diameter, is melted and recast into a right circular conical mould with base diameter of 35 cm. Find the height of the cone.

This question was asked in 2001 cbse board exam. Question from RS Aggarwal book chapter volume and surface area of ...Read more

1 … 312 313 314 … 360

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Discy Latest Questions

Prove that : ( cos A–sin A+1)/( cos A +sin A–1) = cosec A + cot A, (using the identity cosec^2A = 1+cot2A).

Ratio and proportion

Which term of the AP 5 /6 , 1, 1 1 /6 , 1 1 /3 , ….. is 3?

How many three-digit natural numbers are divisible by 7?

A rocket is in the form of a circular cylinder closed at the lower end and a cone of the same radius is attached to the top. The radius of the cylinder is 2.5 m, its height is 21 m and the slant height of the cone is 8 m. Calculate the total surface area of the rocket.

A spherical cannon ball, 28 cm in diameter, is melted and recast into a right circular conical mould with base diameter of 35 cm. Find the height of the cone.